1 /* 2 * Copyright (C) International Business Machines Corp., 2001 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 12 * the GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 17 */ 18 #ifndef _H_ENDIAN24 19 #define _H_ENDIAN24 20 21 /* 22 * endian24.h: 23 * 24 * Endian conversion for 24-byte data 25 * 26 */ 27 #define __swab24(x) \ 28 ({ \ 29 __u32 __x = (x); \ 30 ((__u32)( \ 31 ((__x & (__u32)0x000000ffUL) << 16) | \ 32 (__x & (__u32)0x0000ff00UL) | \ 33 ((__x & (__u32)0x00ff0000UL) >> 16) )); \ 34 }) 35 36 #if (defined(__KERNEL__) && defined(__LITTLE_ENDIAN)) || (defined(__BYTE_ORDER) && (__BYTE_ORDER == __LITTLE_ENDIAN)) 37 #define __cpu_to_le24(x) ((__u32)(x)) 38 #define __le24_to_cpu(x) ((__u32)(x)) 39 #else 40 #define __cpu_to_le24(x) __swab24(x) 41 #define __le24_to_cpu(x) __swab24(x) 42 #endif 43 44 #ifdef __KERNEL__ 45 #define cpu_to_le24 __cpu_to_le24 46 #define le24_to_cpu __le24_to_cpu 47 #endif 48 49 #endif /* !_H_ENDIAN24 */ 50